<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div>
        <span>姓名:</span>
        <input type="text" v-model.trim="name" />
      </div>
      <div>
        <span>年龄:</span>
        <input type="number" v-model.number.trim="age" />
      </div>
      <div>
        <span>性别:</span>
        <select v-model="gender">
          <option value="男">男</option>
          <option value="女">女</option>
        </select>
      </div>
      <div>
        <button @click="add">添加/修改</button>
      </div>
      <div>
        <table border="1" cellpadding="10" cellspacing="0">
          <tr>
            <th>序号</th>
            <th>姓名</th>
            <th>年龄</th>
            <th>性别</th>
            <th>操作</th>
          </tr>
          <tr v-for="(item,index) in arr" :key="item.id">
            <td>{{index+1}}</td>
            <td>{{item.name}}</td>
            <td>{{item.age}}</td>
            <td>{{item.gender}}</td>
            <td>
              <button @click="del(item.id)">删除</button>
              <button @click="change(item.id)">编辑</button>
            </td>
          </tr>
        </table>
      </div>
    </div>
    <script src="./vue.js"></script>
    <script>
      const app = new Vue({
        el: '#app',
        data: {
          name: '',
          age: '',
          gender: '男',
          arr: [
            { id: 1, name: '刘明', age: 18, gender: '男' },
            { id: 2, name: '李华', age: 28, gender: '女' },
          ],
        },
        methods: {
          del(id) {
            return (this.arr = this.arr.filter((item) => item.id !== id))
          },
          add() {
            if (this.name === '') return alert('内容不能为空')
            if (this.age === '') return alert('内容不能为空')
            this.arr.push({
              id: +new Date(),
              name: this.name,
              age: this.age,
              gender: this.gender,
            })
            this.name = ''
            this.age = ''
            this.gender = ''
          },
          change(id) {
            this.arr.forEach((item) => {
              if (item.id === id) {
                this.id = item.id
                this.name = item.name
                this.age = item.age
                this.gender = item.gender
              }
            })
          },
        },
      })
    </script>
  </body>
</html>
